US5204009A - Slurry rising apparatus and method therefor - Google Patents
Slurry rising apparatus and method therefor Download PDFInfo
- Publication number
- US5204009A US5204009A US07/745,007 US74500791A US5204009A US 5204009 A US5204009 A US 5204009A US 74500791 A US74500791 A US 74500791A US 5204009 A US5204009 A US 5204009A
- Authority
- US
- United States
- Prior art keywords
- slurry
- converging
- belts
- stream
- rinsing fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
- B01D33/042—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering whereby the filtration and squeezing-out take place between at least two filtering bands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
- B01D33/722—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
Definitions
- the present invention describes methods and apparatus for rinsing soluble and/or small particulate materials from a slurry.
- the slurry stream is split into two flows and a rinsing fluid is introduced between the two slurry flows.
- the streams are introduced between a pair of converging mesh belts where compression is applied and the filtrate is expelled. Rinse fluid consumption is reduced.
- twin wire press comprises a pair of endless mesh belts, guided over a series of rollers in a converging path.
- the slurry is introduced between the converging belts and compressive forces expel a large percentage of the liquid through the belts.
- An added benefit of removing liquid from the slurry is that dissolved solids and certain small particulates leave the slurry along with the liquid.
- the slurry is thereby rinsed, or washed, as the liquid is extracted. This process is known as dilution washing. High washing efficiencies may be achieved by using more liquid and/or by maximizing the outlet dryness of the dewatered slurry.
- the present invention overcomes the limitations of previous methods by introducing the rinsing fluid between two layers of pulp slurry thereby maximizing the rinsing effect of the liquid as it diffuses through the slurry. Accordingly only relatively small volumes of rinsing liquid are needed. A further advantage is that space requirements are not affected and there is no loss in drainage area of the mesh belts.
- the present invention is the method of rinsing a slurry contained between a pair of opposed mesh belts, travelling in the same direction, comprising the steps of a) separating the slurry flow into two streams, one adjacent to each of the two mesh belts, b) introducing a rinsing fluid between the two slurry streams not more than 12 inches before and not more than 72 inches after the slurry streams contact the converging mesh belts, and (c) applying compressive forces to expel the slurry liquid and the rinsing fluid through the mesh belts.
- Another broad aspect of the present invention is the apparatus for rinsing a slurry contained between a pair of opposed travelling mesh belts, said apparatus consisting of a) means for separating the slurry flow into streams, one adjacent to each belt, b) means for introducing a rinsing fluid between the two slurry streams not more than 12 inches before and not more than 72 inches after the slurry streams contact the converging mesh belts, and c) means to apply compressive forces to expel the slurry liquid and the rinsing fluid through the mesh belts.
- FIG. 1 is a schematic illustration of a twin wire belt press employing one embodiment of the invention.
- FIG. 2 is an enlargement of a portion of the twin wire press illustration which more clearly shows this embodiment of the invention.
- FIG. 3 is a sectional view in plan looking outwardly through the stream splitter showing a saw toothed end of the stream splitter wall extension.
- the invention will be described as being used to remove water from a pulp slurry with water as the rinsing medium. It will be readily appreciated that the principles are equally valid for any type of slurry with any type of fluid as a rinsing medium.
- the invention is adapted for use in connection with a twin wire press which comprises a first mesh belt 1 and a second mesh belt 2.
- the endless mesh belts 1 and 2 are guided by rolls 5, 6, 7, 8, 9 and 10 to form two closed paths.
- a drive means, not shown, connected to rolls 6, causes the mesh belts 1 and 2 to move at equal linear speeds around their respective paths.
- the wire paths form a converging section 11 between rolls 9 and 8 after which they pass through an "S" section formed by rolls 8 and a press section formed by rolls 7.
- a liquid pulp slurry is fed to the machine via inlet pipes 3.
- the inlet pipes 3 are connected to a flow distribution device 4 which causes the slurry to spread uniformly across the width of the machine.
- a stream splitting device 12 is attached to the flow distribution device 4 via support posts 16. As shown in FIG. 2, as the slurry flows past the stream splitting device it is separated into two flows, one flow adjacent to the upper wire 1 and one flow adjacent to the lower wire 2.
- the stream splitter 12 is hollow.
- the hollow cavity 13 is connected via small pipes 14 to a large pipe 15.
- the small pipes 14 and the support posts 16 are of similar dimensions and are preferably foil shaped in cross-section in order to minimize transverse disturbance of the slurry flow.
- the walls 20 of the stream splitter are generally rigid in the region where the pipes and support posts are attached.
- the wall extensions 21 may be rigid, semi rigid or flexible. Rinsing water is introduced into the large pipe 15.
- Plane 1--1 can be defined by the dimension "L", which is the distance from the center line of the breast rolls 9 to the plane 1--1.
- L is the distance from the center line of the breast rolls 9 to the plane 1--1.
- a positive dimension L indicates that plane 1--1 is situated after the breast rolls 9 as shown in FIG. 2. It is also possible for L to be negative indicating that plane 1--1 is situated prior to the breast rolls 9.
- L' equals L, however it is equally possible to have L' greater or less than L.
- other embodiments may have non-linear trailing edges of wall extensions 21.
- the trailing edges may be sawtoothed as shown in FIG. 3.
- L is positive
- the two pulp streams begin to dewater through the mesh belts prior to the water injection zone defined by plane 1--1.
- the converging mesh belts we can now visualize three layers, the upper layer of pulp slurry 17, the lower layer of pulp slurry 18 and a central layer of rinsing water 19.
- the length of this converging dewatering zone is indicated in FIG. 1 as dimension M.
- dimension L would be in the range of -12" ⁇ L ⁇ 72" and dimension M would be in the range of M>24". These dimensions may vary considerably depending on the characteristics of the slurry.
- the amount of rinse water introduced into the large pipe 15 can be readily varied in order to achieve the desired degree of washing.
- the required quantity of rinse water may be greatly reduced without deleteriously affecting the twin wire press operation, capacity or washing efficiency.
- the rinsing stream may be divided into two streams. In this way the proportion of rinsing fluid passing through the upper and lower wires may be more accurately controlled.
Abstract
Description
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/745,007 US5204009A (en) | 1991-08-14 | 1991-08-14 | Slurry rising apparatus and method therefor |
CA002076135A CA2076135C (en) | 1991-08-14 | 1992-08-13 | Slurry rinsing apparatus and method therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/745,007 US5204009A (en) | 1991-08-14 | 1991-08-14 | Slurry rising apparatus and method therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
US5204009A true US5204009A (en) | 1993-04-20 |
Family
ID=24994836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/745,007 Expired - Fee Related US5204009A (en) | 1991-08-14 | 1991-08-14 | Slurry rising apparatus and method therefor |
Country Status (2)
Country | Link |
---|---|
US (1) | US5204009A (en) |
CA (1) | CA2076135C (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556508A (en) * | 1992-04-08 | 1996-09-17 | Kvaerner Pulping Technologies Aktiebolag | Method for treating pulp |
US6228215B1 (en) | 1998-04-06 | 2001-05-08 | Hoffman Enviornmental Systems, Inc. | Method for countercurrent treatment of slurries |
US20040040678A1 (en) * | 2000-10-25 | 2004-03-04 | Rolf Ekholm | Method and apparatus for washing a fibre suspension |
US20050034827A1 (en) * | 2001-12-05 | 2005-02-17 | Daniel Soderberg | Method of forming a fibrous web and machine therefor |
US20050070250A1 (en) * | 1997-05-21 | 2005-03-31 | E.S.P. Networks, Inc. | Call receiving system apparatus and method having a dedicated switch |
US20080151681A1 (en) * | 2006-12-20 | 2008-06-26 | Carter Day International, Inc. | Slurry flow divider |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1782215A (en) * | 1928-09-06 | 1930-11-18 | Albert D Stewart | Apparatus for producing felted fibrous board |
US3092538A (en) * | 1960-11-09 | 1963-06-04 | Beloit Iron Works | Method and apparatus for feeding stock to paper making machine |
US3802960A (en) * | 1972-04-12 | 1974-04-09 | Scott Paper Co | Method and apparatus for conditioning paper stock flowing to papermaking machine |
US3802965A (en) * | 1970-05-08 | 1974-04-09 | H Arledter | Twin wire papermaking machine with guide bodies placed below the suspension level between the converging wires |
US3839143A (en) * | 1972-06-08 | 1974-10-01 | Beloit Corp | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
US3840430A (en) * | 1972-06-30 | 1974-10-08 | Beloit Corp | Twin-wire papermaking machine wherein the forming wires pass through the slice chamber which contains flexible trailing elements |
US3923593A (en) * | 1971-12-03 | 1975-12-02 | Beloit Corp | Multiple ply web former with divided slice chamber |
US4141788A (en) * | 1978-05-02 | 1979-02-27 | Beloit Corporation | Method of and means for forming multi-ply paper webs from a single headbox |
-
1991
- 1991-08-14 US US07/745,007 patent/US5204009A/en not_active Expired - Fee Related
-
1992
- 1992-08-13 CA CA002076135A patent/CA2076135C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1782215A (en) * | 1928-09-06 | 1930-11-18 | Albert D Stewart | Apparatus for producing felted fibrous board |
US3092538A (en) * | 1960-11-09 | 1963-06-04 | Beloit Iron Works | Method and apparatus for feeding stock to paper making machine |
US3802965A (en) * | 1970-05-08 | 1974-04-09 | H Arledter | Twin wire papermaking machine with guide bodies placed below the suspension level between the converging wires |
US3923593A (en) * | 1971-12-03 | 1975-12-02 | Beloit Corp | Multiple ply web former with divided slice chamber |
US3802960A (en) * | 1972-04-12 | 1974-04-09 | Scott Paper Co | Method and apparatus for conditioning paper stock flowing to papermaking machine |
US3839143A (en) * | 1972-06-08 | 1974-10-01 | Beloit Corp | Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween |
US3840430A (en) * | 1972-06-30 | 1974-10-08 | Beloit Corp | Twin-wire papermaking machine wherein the forming wires pass through the slice chamber which contains flexible trailing elements |
US4141788A (en) * | 1978-05-02 | 1979-02-27 | Beloit Corporation | Method of and means for forming multi-ply paper webs from a single headbox |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556508A (en) * | 1992-04-08 | 1996-09-17 | Kvaerner Pulping Technologies Aktiebolag | Method for treating pulp |
US20050070250A1 (en) * | 1997-05-21 | 2005-03-31 | E.S.P. Networks, Inc. | Call receiving system apparatus and method having a dedicated switch |
US6228215B1 (en) | 1998-04-06 | 2001-05-08 | Hoffman Enviornmental Systems, Inc. | Method for countercurrent treatment of slurries |
US20040040678A1 (en) * | 2000-10-25 | 2004-03-04 | Rolf Ekholm | Method and apparatus for washing a fibre suspension |
US6946072B2 (en) * | 2000-10-25 | 2005-09-20 | Kvaerner Pulping Ab | Method and apparatus for washing a fibre suspension |
US20050034827A1 (en) * | 2001-12-05 | 2005-02-17 | Daniel Soderberg | Method of forming a fibrous web and machine therefor |
US7429307B2 (en) * | 2001-12-05 | 2008-09-30 | Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab | Method of forming a fibrous web |
US20090020251A1 (en) * | 2001-12-05 | 2009-01-22 | Daniel Soderberg | Machine for forming a fibrous web |
US20080151681A1 (en) * | 2006-12-20 | 2008-06-26 | Carter Day International, Inc. | Slurry flow divider |
WO2008079527A1 (en) * | 2006-12-20 | 2008-07-03 | Carter Day International, Inc. | Slurry flow divider |
US7875192B2 (en) | 2006-12-20 | 2011-01-25 | Carter Day International, Inc. | Slurry flow divider |
Also Published As
Publication number | Publication date |
---|---|
CA2076135A1 (en) | 1993-02-15 |
CA2076135C (en) | 1999-11-16 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: HYMAC LTEE LTD. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROWLAND, STEVE;REEL/FRAME:005819/0636 Effective date: 19910726 |
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Owner name: KVAERNER HYMAC INC., CANADA Free format text: CHANGE OF NAME;ASSIGNOR:HYMAC LTEE - HYMAC LTD.;REEL/FRAME:006384/0731 Effective date: 19921009 |
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Owner name: SUNDS DEFIBRATOR LTEE/LTD, CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KVAERNER CANADA, INC.;REEL/FRAME:009586/0429 Effective date: 19981026 |
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Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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